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1 Answer
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Let me ask you a similar question in English: “If I find the word ‘credit’ on a receipt on the same line as the total sum, can I conclude that the transaction was paid for by credit card?” I do not know any concrete case where you cannot, but I cannot guarantee that it never means anything else unless I see the whole receipt. After all, understanding a text for sure requires more than pattern matching.

However if you see クレジット支払(額) then you can probably pretty safely assume that much was paid by credit.
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ssbDec 17 '12 at 8:03

The only examples in English I can think of are if for some reason the person was owed money back by the company. You can have store credit (for example after returning an item) or an account with a business could be 'in credit' (if you were overcharged and then it was corrected). I don't know if these would be called クレジット in Japanese, though.
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nkjtDec 18 '12 at 13:39